Photography

1 readers

1 users here now

A place to politely discuss the tools, technique and culture of photography.

This is not a good place to simply share cool photos/videos or promote your own work and projects, but rather a place to discuss photography as an art and post things that would be of interest to other photographers.

founded 11 months ago

MODERATORS

communick@viewfinder.pro

Are those phone lens objectives the equialent of holding binoculars in front of a DSLR with an objective? (alien.top)

submitted 11 months ago by rascian038@alien.top to c/photography@viewfinder.pro

3 comments fedilink hide all child comments

I never used them, so maybe I'm wrong, but aren't they just things you put in front of an existing regular phone camera (for example 24mm on the new Iphone) and then they just take a picture with a 24mm opening, but looking through whatever 120mm telephoto objective you stacked on top, without it having an effect on the photo quality?

In other words, if a 24mm opening can let a certain amount of light and information to the sensor, do the telephoto lenses change that somehow or is it literaly as if you pointed the phone through a binocular, since whatever passes through the telephoto then has to filter further through the standard 24mm lens?

you are viewing a single comment's thread
view the rest of the comments

[–] ApatheticAbsurdist@alien.top 1 points 11 months ago

Yes. Binoculars also reduce the amount of light your eyes see since you're taking a narrow field of view and expanding it to cover your fully vision.

This is also why f/stops work f/stops are the focal length divided by the (apparent) diameter of the aperture. If you add a teleconverter to a lens that magnifies the focal length by 1.4, you reduce the effective aperture by a stop (1.4 is roughly the square root of two)